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首页> 外文期刊>Environmental Science & Technology >Linking Load, Fuel, and Emission Controls to Photochemical Production of Secondary Organic Aerosol from a Diesel Engine
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Linking Load, Fuel, and Emission Controls to Photochemical Production of Secondary Organic Aerosol from a Diesel Engine

机译：将负载，燃料和排放控制与柴油发动机的二次有机气溶胶的光化学生产联系起来

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摘要

Diesel engines are important sources of fine particle pollution in urban environments, but their contribution to the atmospheric formation of secondary organic aerosol (SOA) is not well constrained. We investigated direct emissions of primary organic aerosol (POA) and photochemical production of SOA from a diesel engine using an oxidation flow reactor (OFR). In less than a day of simulated atmospheric aging, SOA production exceeded POA emissions by an order of magnitude or more. Efficient combustion at higher engine loads coupled to the removal of SOA precursors and particle emissions by aftertreatment systems reduced POA emission factors by an order of magnitude and SOA production factors by factors of 2—10. The only exception was that the retrofitted aftertreatment did not reduce SOA production at idle loads where exhaust temperatures were low enough to limit removal of SOA precursors in the oxidation catalyst. Use of biodiesel resulted in nearly identical POA and SOA compared to diesel. The effective SOA yield of diesel exhaust was similar to that of unburned diesel fuel. While OFRs can help study the multiday evolution, at low particle concentrations OFRs may not allow for complete gas/particle partitioning and bias the potential of precursors to form SOA.
机译：柴油机是城市环境中细颗粒物污染的重要来源，但它们对二次有机气溶胶（SOA）在大气中形成的贡献并未受到很好的限制。我们研究了使用氧化流反应器（OFR）从柴油机中一次有机气溶胶（POA）的直接排放和SOA的光化学生产。在不到一天的模拟大气老化中，SOA的生产量超过了POA排放量一个数量级甚至更多。在较高的发动机负载下进行高效燃烧，再加上后处理系统去除了SOA前体和颗粒物排放，使POA排放因子降低了一个数量级，SOA生产因子降低了2-10倍。唯一的例外是，在废气温度足够低以限制氧化催化剂中SOA前体的去除的空载情况下，改装后的处理不会降低SOA的产生。与柴油相比，生物柴油的使用产生了几乎相同的POA和SOA。柴油机排气的有效SOA产量与未燃烧柴油机的相似。尽管OFR可以帮助研究多日演变，但在低颗粒浓度下，OFR可能无法实现气体/颗粒的完全分配，并会偏析前体形成SOA的潜力。

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  • 来源
    《Environmental Science & Technology》 |2017年第3期|1377-1386|共10页
  • 作者

    Shantanu H. Jathar; Beth Fπedman; Abril A Galang; Michael F. Link; Patrick Brophy; John Volckens; Sailaja Eluri; Delphine K. Farmer;

  • 作者单位

    Department of Mechanical Engineering, Colorado State University, Fort Collins, Colorado 80525, United States;

    Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States;

    Department of Mechanical Engineering, Colorado State University, Fort Collins, Colorado 80525, United States;

    Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States;

    Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States;

    Department of Mechanical Engineering, Colorado State University, Fort Collins, Colorado 80525, United States;

    Department of Mechanical Engineering, Colorado State University, Fort Collins, Colorado 80525, United States;

    Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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